Avi K:
I have also seen the official shusher system. It was barely effective.
The cell phone issue is not relevant on Shabbos and Yom Tov. It is a huge problem, as the ringing is only a part of the problem. The answering, talking, running out, etc., are all disruptive to others. I choose to not have my phone with me when I go to shul. We have mini-lockers (with charging cables) where we can leave the phones while we daven. Just think how distracting the vibrating phone can be when one is trying to focus on davening.
Instead of boring holes in ears, how about a dab of super glue on the lips?